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Finding the Fourth Proportional to 1,039.35, 1,559.10 and 423.05

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Solution

The fourth proportional to 1,039.35, 1,559.10 and 423.05 is: 634.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.35 : 1,559.10 = 423.05 : x
  2. Step 2: Convert to fraction form
    1,039.35/1,559.10 = 423.05/x
  3. Step 3: Cross multiply
    1,039.35x = 1,559.10 × 423.05
  4. Step 4: Simplify right side
    1,039.35x = 659,577.26
  5. Step 5: Solve for x
    x = 659,577.26/1,039.35
  6. Step 6: Final answer
    x = 634.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.